Should I buy a SLR?

Hehe, this may be the legendary "war between sensibility and rationality"! I am also a photographer. I can understand the contradiction between photography and study. But ~ since you like it, let's focus on it.

I don't know what level your photography skill has reached, but it should not be professional, so you will ask that question in the end. If you think ordinary cameras can't satisfy your skills, start with an entry-level SLR. SLR below 4000 is OK, Canon's 1000D is not bad, and the Pentax K200D you mentioned is not bad. They are all standard on 18~55.

If the economy permits, buy it.

On the other hand, no matter how busy the homework is, there is still time after school. Even if it is 20 minutes between classes, you can enjoy the happiness of SLR. Just be busy. Moreover, playing photography is not busy or tired. This is a good way to relax and make your body and mind relaxed and happy.

Mine is Canon's 1000D, which is similar to that, but the price is cheaper. The following is a comparison between the two modes. I hope I can help you ~ ~